It depends on what kind of polyurethane coat was used on the wood, but there are more general solvents you can try first. ... Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. Thinner or denatured alcohol can remove polyurethane for the most part. … Scrape the area with a plastic scraper or plastic putty knife. Either 91% isopropyl, or denatured alcohol (Lowes, Home Depot, paint stores) should work. Step 3: Use The Mixture To Remove Polyurethane. After the wood is dry, stain, paint or install the untreated wood. The denatured alcohol will dry quickly and clean the wood. … Brush stripper onto an area adjacent to the area previously stripped.More items…. For a better result, stroke the place two or three times so that every part of the polyurethane gets covered. Not enough to be a serious problem for your application. Mix with a wooden stir stick, scraping into the mixture any lacquer from the base and sides of the can. Ensure you rub with the grain so as not to introduce any scratches that may become visible when the finish has been applied. Apply the solvent with a cloth rag. No Result Stir the mixture thoroughly with a wooden stick. Similar Asks. Use a paintbrush to apply the solution to the polyurethane finish. Apply the mixture onto the polyurethane finish, covering the stained wood. to thin I use denatured alcohol - but do note - the waxes will fall out of suspension with time, so don't thin a big batch for later-later-long term use. Scrubbing is futile without the right ingredients, so don't rub your hands raw. The alcohol should dissolve any stripping solvents on the first pass. In this procedure, denatured alcohol acts as a cleaning agent. Step Two: Mix the Lacquer and denatured Alcohol. I wipe on oil base poly all the time - Minwax does not need thinning, others are noticeable thicker. Not often used because it’s been replaced with polyurethane and other resins, shellac works best if thinned with denatured alcohol. At the same time, move any lacquer that might settle on the container’s base or sides. The advantage of this mixture of denatured alcohol and lacquer thinner is while it will remove the finish from the surface of the wood, it’s not strong enough to damage the wood itself. Several substances can be used to thin polyurethane including turpentine, mineral spirits, paint thinner or, in some cases, water. A slight thinning (5-10%) generally allows the finish to flow out better but the primary way to remove bubbles is to first apply the varnish by flowing it on--don't do a lot of brushing back and forth--and then "tip" it off using an almost dry brush and just use long strokes just barely letting the bristle tips touch the surface. … Apply stripper using a brush. Polyurethane is a clear top coating applied over wood finish and paint. This task is accomplished through the use of chemical paint and varnish removers and light sanding.Assemble equipment. Take a wad of 0000 steel wool, liberally wetted with denatured alcohol, and wash down the piece one area at a time. Polyurethane can be removed using solvents that can be found at your local hardware. - Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. 23. Step 3: Use the mixture of denatured alcohol and lacquer thinner to remove polyurethane . Therefore, it won’t strip away the stain. You can use a regular paintbrush to do this. You can make your brush easier to clean by dipping it in mineral spirits or water, depending on whether you are using an oil- or water-based polyurethane … ... - Apply the mixture onto the polyurethane finish, covering the stained wood. Epoxies can be thinned with alcohol, but don't use the common 70% isopropyl alcohol (rubbing alcohol). What can I use to remove polyurethane? 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